function getXMLHttp() {
  var xmlHttp
  try {
    //Firefox, Opera 8.0+, Safari
    xmlHttp = new XMLHttpRequest();
  } catch(e) {
    //Internet Explorer
    try {
      xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch(e) {
      try {
        xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
      } catch(e) {
        alert("Your browser does not support AJAX!")
        return false;
      }
    }
  }
  return xmlHttp;
}

function selectBanner(bannerId) {
  var xmlHttp = getXMLHttp();
 
  xmlHttp.onreadystatechange = function() {
    if(xmlHttp.readyState == 4) {
      HandleResponse(xmlHttp.responseText);
    }
  }

  var url = "banner_select.php?bannerId=" + bannerId;
  xmlHttp.open("GET", url, true);
  xmlHttp.send();
}

// se llama cuando vuelvo del get
function HandleResponse(response) {
	alert('Banner Changed');
}



